时间:2021-04-07 编辑:
这篇文章主要介绍了jQuery实现鼠标拖动图片功能,本文通过实例代码给大家介绍的非常详细,对大家的学习或工作具有一定的参考借鉴价值,需要的朋友可以参考下
本例利用jQuery实现一个鼠标托动图片的功能。
首先设一个wrapper,wrapper内的坐标即图片移动的坐标
1 2 3 4 5 | #wrapper{ width: 1000px; height:1000px; position:relative; } |
设置图片div,这个div即要拖动的div
1 2 3 4 5 6 7 8 9 | #div1{ position: absolute; left:0px; top:0px; width: 300px; height: 200px; background: url( "d:/Pictures/Earth.jpg" ); background-size:contain; } |
上面设置了wrapper的定位为relative,div1的定位为absolute。
接下来设计拖动的算法:
思路如下:
1.鼠标点下时让div跟随鼠标移动
2.鼠标松开时停止跟随
首先需要一个函数,他会将该div的坐标改变为当前鼠标的位置:
首先需要定义几个变量,保存当前鼠标的坐标以及图片的坐标
1 2 3 4 5 | var timer; var mouseX=0; var mouseY=0; var pic_width = parseInt($( "#div1" ).css( "width" )); var pic_height = parseInt($( "#div1" ).css( "height" )); |
那么现在就需要为wrapper添加一个事件监听器,鼠标在wrapper中移动时,修改变量mousex,mousey的值
1 2 3 4 | $( "#wrapper" ).mousemove( function (e){ mouseX = e.clientX; mouseY = e.clientY; }); |
编写follow函数,并用计时器调用它
1 2 3 4 5 6 7 8 9 10 11 | $( "#div1" ).mousedown( function (){ timer=setInterval(follow,10); }); $( "#div1" ).mouseup( function (){ clearInterval(timer); }); var follow = function (){ $( "#div1" ).css( "left" ,mouseX-pic_width/2); $( "#div1" ).css( "top" ,mouseY-pic_height/2); }; |
完整代码如下所示:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 | <!doctype html> <html> <head> <script type = "text/javascript" src = "jquery.js" ></script> <style type = "text/css" > #wrapper{ width: 1000px; height:1000px; position: relative; background: linear-gradient(lightblue,white); font-size: 40px; } #div1{ position: absolute; left:0px; top:0px; width: 300px; height: 200px; background: url( "d:/Pictures/Earth.jpg" ); background-size:contain; } </style> </head> <body> <div id = "wrapper" > Lorem, ipsum dolor sit amet consectetur adipisicing elit. Impedit numquam accusamus explicabo praesentium laudantium et accusantium, ab ipsum, excepturi necessitatibus quos iste ad qui deleniti sed debitis reiciendis quam nisi. <div id = "div1" > </div> </div> <script> var timer; var mouseX=0; var mouseY=0; var pic_width = parseInt($( "#div1" ).css( "width" )); var pic_height = parseInt($( "#div1" ).css( "height" )); $( "#wrapper" ).mousemove( function (e){ mouseX = e.clientX; mouseY = e.clientY; }); $( "#div1" ).mousedown( function (){ timer=setInterval(follow,10); }); $( "#div1" ).mouseup( function (){ clearInterval(timer); }); var follow = function (){ $( "#div1" ).css( "left" ,mouseX-pic_width/2); $( "#div1" ).css( "top" ,mouseY-pic_height/2); }; </script> </body> </html> |
最终效果: